<template>
  <div class='xtx-carousel' @mouseenter="stop" @mouseleave="start">
    <!-- 轮播图容器 -->
    <ul class="carousel-body">
      <li class="carousel-item" :class="{ fade: index === i }" v-for="(item, i) in sliders" :key="i">
        <!-- 图片展示 -->
        <RouterLink v-if="item.imgUrl" to="/">
          <img :src="item.imgUrl" alt="">
        </RouterLink>
        <!-- 这里因该放商品列表了 -->
        <div v-else class="slider">
          <RouterLink v-for="goods in item" :key="goods.id" :to="`/product/${goods.id}`">
            <img :src="goods.picture" alt="">
            <p class="name ellipsis">{{ goods.name }}</p>
            <p class="price">&yen;{{ goods.price }}</p>
          </RouterLink>
        </div>
      </li>
    </ul>
    <!-- 上一张 -->
    <a @click="toggle(-1)" href="javascript:;" class="carousel-btn prev"><i class="iconfont icon-angle-left"></i></a>
    <!-- 下一张 -->
    <a @click="toggle(1)" href="javascript:;" class="carousel-btn next"><i class="iconfont icon-angle-right"></i></a>
    <!-- 小圆点指示器 -->
    <div class="carousel-indicator">
      <span @click="(index=i)" v-for="(item, i) in sliders" :key="i" :class="{ active: index === i }"></span>
    </div>
  </div>
</template>

<script setup>

const props = defineProps({
  sliders: { // 图片连接
    type: Array,
    default: () => []
  },
  autoPlay: { // 是否自动播放
    type: Boolean,
    default: false
  },
  // 参数3轮播间隔时间
  duration: {
    type: Number,
    default: 3000
  }
})
const index = ref(0) // 控制显示哪张图片

// 轮播图逻辑
let timer = null
const autoPlay = () => {
  clearInterval(timer)
  timer = setInterval(() => {
    index.value++
    if (index.value >= props.sliders.length) {
      index.value = 0
    }
  }, props.duration)
}
// 自动播放函数执行条件1：监听sliders是否传入数据，有图片才能展示，条件2：
// 是否传入autopaly为ture，有autoplay才能启动
watch(() => props.sliders, (newValue) => {
  if (newValue.length && props.autoPlay) { // 同时满足才可以
    autoPlay()
  }
}, {
  immediate: true // 当数据是写死的化，要求watch一开始就执行一次
})
// 鼠标进入时暂停定时，离开开启
const stop = () => {
  if (timer) {
    clearInterval(timer)
  }
}
const start = () => {
  if (props.sliders.length && props.autoPlay) {
    autoPlay()
  }
}
// 控制器
const toggle = (i) => {
  index.value += i
  if (index.value >= props.sliders.length) {
    index.value = 0
    return
  }
  if (index.value < 0) {
    index.value = props.sliders.length - 1
  }
}
// 组件销毁时清除timer
onUnmounted(() => {
  clearInterval(timer)
})
</script>
<script>
export default {
  name: 'XtxCarousel'
}
</script>
<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;

  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }

    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;

      &.fade {
        opacity: 1;
        z-index: 1;
      }

      img {
        width: 100%;
        height: 100%;
      }
    }

    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;

      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;

        ~span {
          margin-left: 12px;
        }

        &.active {
          background: #fff;
        }
      }
    }

    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, .2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;

      &.prev {
        left: 20px;
      }

      &.next {
        right: 20px;
      }
    }
  }

  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}

// 轮播商品
.slider {
  display: flex;
  justify-content: space-around;
  padding: 0 40px;

  >a {
    width: 240px;
    text-align: center;

    img {
      padding: 20px;
      width: 230px !important;
      height: 230px !important;
    }

    .name {
      font-size: 16px;
      color: #666;
      padding: 0 40px;
    }

    .price {
      font-size: 16px;
      color: @priceColor;
      margin-top: 15px;
    }
  }
}
</style>
